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  1. Qt
  2. QTBUG-55778

requestAnimationFrame() invoked too often

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.9.0 Alpha
    • 5.7.0, 5.8.0
    • Quick: SceneGraph
    • None
    • Ubuntu 14.04

    Description

      The following code invokes the crank() callback many tens of times per millisecond, and prevents any other content from showing in the application (e.g. the "Hi Mom!" text).

      import QtQuick 2.7
import QtQuick.Window 2.2
Window {
    visible:true; width:100; height:100
    Text { text:"Hi Mom!" }
    Canvas {
        anchors.fill:parent
        Component.onCompleted: crank()
        function crank(){
            console.log(+new Date)
            requestAnimationFrame(crank)
        }
    }
}

      It appears that requestAnimationFrame() is broken and useless.

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-88339 Application Zoom freezes with "Polish loop detected"

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-64741 qmlscene eats up all CPU (infinite loop)

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          For Gerrit Dashboard: QTBUG-55778
          # Subject Branch Project Status CR V
          184377,3 Canvas Item: Prevent polish loop when calling requestAnimationFrame 5.9 qt/qtdeclarative Status: MERGED +2 0

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            People

              janichol Andy Nichols
              phrogz Gavin Kistner
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              Dates

                Created:
                Updated:
                Resolved:

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